<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert show-icon :closable="false" title="注意：只允许为第三级分类设置参数" type="warning"></el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择框 -->
          <el-cascader
            v-model="seletedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag :key="i" v-for="(item,i) in scope.row.attr_vals" closable>{{item}}</el-tag>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand"></el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>

export default {
  data: function () {
    return {
      catelist: [],
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定得到的数组
      seletedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态属性数据
      manyTableData: [],
      // 静态属性属性数据
      onlyTableData: [],
      // 控制添加对话框显示与隐藏
      addDialogVisible: false,
      addForm: {},
      addFormRules: {
        attr_name: ''
      },
      addFormRef: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框显示与隐藏
      editDialogVisible: false,
      editForm: {},
      editFormRules: { attr_name: '' },
      editFormRef: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created: function () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    getCateList: async function () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      // DATA是对象
      this.catelist = res.data
    },
    // 级联选择框选中项发生变化触发函数
    handleChange: async function () {
      this.getParamsData()
    },
    // 获取参数列表数据
    getParamsData: async function () {
      // seletedCateKeys长度不为三，则选择的不是第三级
      if (this.seletedCateKeys.length !== 3) {
        this.seletedCateKeys = []
      }
      // console.log(this.cateId)
      // 根据所选分类id，和当前所处面板，获取其所对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      console.log(res.data)
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
      // console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
      })
      // console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab页签点击事件的处理函数
    handleTabClick: function () { this.getParamsData() },
    addDialogClosed: function () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams: function () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
          { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改对话框
    showEditDialog: async function (id) {
      // console.log(1)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed: function () { this.$refs.editFormRef.resetFields() },
    editParams: function () {
      // console.log(1)
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.$message.success('修改参数成功')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    removeParams: async function (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
      // 删除
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`,
        { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
      if (res.meta.status !== 200) return this.$message.error('删除参数失败')
      this.$message.success('删除参数成功')
      this.getParamsData()
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true
    isBtnDisabled: function () {
      if (this.seletedCateKeys.length !== 3) return true
      return false
    },
    // 当前选中的三级分类的id
    cateId: function () {
      if (this.seletedCateKeys.length === 3) return this.seletedCateKeys[2]
      return null
    },
    // 动态计算标题的文本
    titleText: function () {
      if (this.activeName === 'many') return '动态参数'
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
</style>
